Tetrahedrite(Cu,Fe)12Sb4S13

Tetrahedrite, a member of the tetrahedrite group, is extremely rare at Mont-Saint-Hilaire.

PHYSICAL CHARACTERISTICS:

Color ranges from steel-gray to black.Luster is metallic.Diaphaneity is opaque. Crystal System is isometric; I43m.Crystal Habits include fine-grained aggregates to 1mm and crude aggregates of crystals.Cleavage none apparent.Fracture is uneven to subconchoidal.Hardness is 3 - 4.5Specific Gravity is approximately 4.8 g/cm3.Streak is black.Associated Minerals include aegirine, analcime, griceite, lovozerite, molybdenite, pectolite, sodalite and villiaumite.Distinguishing Features: Crystal habit.Origin: Named in 1845 for the common tetrahedral form of its crystals.